Over 900 dead pigs were found floating in a river near Shanghai, and Chinese officials said Sunday that they had launched an investigation into what happened—and if drinking water has been compromised. There is no sign that the pigs were dumped there or died as part of an epidemic, officials said, and they are trying to determine where the dead pigs came from. Officials also insisted that the drinking water is being tested for contamination, as the Huangpu River is a major water source for Shanghai.